Evidence row 120272

Observed 26 Oct 2026, 14:40 UTC, by baseline/1.

Kind: listing
About: source_record x402_bazaar:https://saylorinnovations.com/api/kb/python-string-formatting-fstring-format-spec-rounding-percent-pitfalls
Recorded: 26 Oct 2026, 14:40 UTC
Previous row: None: the first of its kind about this subject
Body SHA-256: 507c73872ddceebfc3852c818d9d4b0b3eff7d987d164d3d21ebafd943ae2925
Leaf: 0x042065d20480e57c1073a266b901fff0be977010a55603b359faec3eb6c7a6c6

What was observed

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  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
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        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
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          "name": "USD Coin",
          "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
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        "maxTimeoutSeconds": 120,
        "network": "eip155:137",
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          "facilitatorOnly": true,
          "memo": "saylor:python-string-formatting-",
          "name": "USD Coin",
          "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
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        },
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        "network": "eip155:42161",
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        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
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        "extra": {
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          "native": true,
          "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
          "quotedLamports": "95702",
          "reference": "G3vFRqkJwZqajhUC2mMEt6PCaZaqUDC8ezPNPrkWfhTW",
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    ],
    "description": "Python f-string formatting - 2.675 formats as 2.67, round-half-even in .0f, thousands and percent specs, = debug, 3.10 quote and backslash limits",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "body": "Executed on Python 3.10: f\"{2.675:.2f}\", .0f on 0.5, 1.5 and 2.5, thousands separators, percent, zero padding, alignment, sign, general and exponent formats, = debug output, nested width specs, and SyntaxError for reused quotes and backslashes in expressions.",
              "c": "Self-Hosting & Infra",
              "id": "python-string-formatting-fstring-format-spec-rounding-percent-pitfalls",
              "t": "Python String Formatting: f-string Format Specs, Rounding Surprises, Percent Style and the 3.10 Quote Limits"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
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                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
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                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
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                      "type": "string"
                    },
                    "c": {
                      "description": "Category of the guide",
                      "type": "string"
                    },
                    "id": {
                      "description": "Identifier of the record",
                      "type": "string"
                    },
                    "license": {
                      "description": "License identifier",
                      "type": "string"
                    },
                    "price": {
                      "description": "Price",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "t": {
                      "description": "Title of the guide",
                      "type": "string"
                    }
                  },
                  "required": [
                    "id",
                    "t",
                    "c",
                    "body"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
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              ],
              "type": "object"
            }
          },
          "required": [
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          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-20T12:55:06.816Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-20T12:55:06.082Z"
    },
    "resource": "https://saylorinnovations.com/api/kb/python-string-formatting-fstring-format-spec-rounding-percent-pitfalls",
    "serviceName": "Saylor Innovations Guide Library",
    "tags": [
      "python",
      "f-strings",
      "formatting",
      "rounding",
      "strings"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Python f-string formatting - 2.675 formats as 2.67, round-half-even in .0f, thousands and percent specs, = debug, 3.10 quote and backslash limits"
}

What the leaf hashes

{"body":"507c73872ddceebfc3852c818d9d4b0b3eff7d987d164d3d21ebafd943ae2925","id":120272,"kind":"listing","method":"baseline/1","observed_us":1793025617580028,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/kb/python-string-formatting-fstring-format-spec-rounding-percent-pitfalls","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

0x04206ecde9de4b18bb37dccf5842d96df94cb997425f7ce8eda1f514dd4c6893
0x23f58d1f489d8e02b0ddd97d41ba0859dec9995c06d61c5d3fa95bb1ef193d3b
0xe963305ce71369037890654a984d36509232850e25a509ce3818a3338c82286f
0x286eadf183869ec49f927dad24909b16a2a8e6604bea092d0cea95904e23804e
0x1657bbd8470a1cd8a5e8dde89dbbcadb65afb6a3a35ade0d2026561197bdf5f7
0x178dc48356494b197681853b1b2abb09d02a0326afc67407e0a5299006d4342c
0x1c754d919379cde06e37ca28ee07a21a8a1c47d4ce1b93c7278435b079f65994
0x59ce2c0a0339e7340ba5fe737b811d5a00af63230c9980e0eed6619c1bd2b708
0xd78e00fa1d778becb725175fd7f00b0f161a35f4a02784eb7f7e1d11bd776a02
0x28efbda3043fe0ad6931419f72618781ad3b289c046ef258b300ab314d01bde2
0x0dadbaadc61f6ee6be4586a11afb533e54da3f5fef5c8ec2ecba1bfa573ce6d3
0x23033d81d9f4be06225e4276d276e0e8e02abc173d156a1b9a8fd5e4803ad199
0x610fdf3e989af0a6b4a400a3a8aab9156d757f8c96efe4e9d0594dfd04de1cc0
0xd1d3499072edb10edc68f84bcae2365d2ab534df689250cab18c751b6f13b6ff
0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39
0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root: 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
Chained: 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
Published: On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae

How to check it · This row as JSON